Rothmannia engleriana (K.Schum.) Keay

Species

Angiosperms > Gentianales > Rubiaceae > Rothmannia

Characteristics

Small tree (? 0.9–)1.8–8.4 m. tall; young branches puberulous or velutinous, older branches with cracked reddish bark.. Leaves in pairs (or occasionally ? ternate); blades oblanceolate to elliptic or sometimes obovate to broadly obovate, 9.3–30 cm. long, 3.8–14.8 cm. wide, apex rounded to shortly acuminate, base cuneate, coriaceous, often drying yellowish-green, glabrous above, glabrescent or less often glabrous or pubescent beneath; domatia usually present; petiole 0.3–1.5 cm. long, glabrous to velutinous; stipules triangular, long acuminate, 4–5 mm. long, caducous early on.. Flowers sweetly scented, pendulous in terminal cymes, 3–17-flowered; peduncle up to 1.5 cm. long, usually with primary and secondary branches present, yellowish pubescent when young, flaking and reddish when older; pedicels absent; bracteoles triangular, 1.5–5 mm. long.. Calyx yellowish to amber, pubescent; tube ± 5-grooved and wrinkled when dry, 0.5–1 cm. long; limb-tube 0.4–1.4 cm. long, distincdy wider than the tube, with 5 ridges; lobes linear, 0.3–2.1 cm. long, 1.5–2.5(–4) mm. wide.. Corolla white with red-purple spots at throat, golden pubescent outside when dry; tube short, narrowly cylindrical below, campanulate above, 4.7–7.2 cm. long, the campanulate portion 2.7–4.4 cm. long, 1.8–4.7 cm. wide at top, 0.3–0.4 cm. wide at base, glabrescent inside; lobes overlapping to left in bud, ovate, 1.1–3.4 cm. long, 1.2–2.3 cm. wide, acute or sometimes obtuse, whitish tomentose above.. Anthers entirely included, 1.4–2.1 cm. long.. Style 3.3–4.5 cm. long, gradually widening towards apex; stigma included, 1.3–2.1 cm. long, 2.5–4 mm. wide.. Fruit rust-coloured, flaking, globose to ellipsoidal, 1.9–4.6 cm. long, the calyx-limb persistent.. Seeds brown, 7 mm. long, 5 mm. wide, ± 1.25 mm. thick.. Fig. 82.
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A small tree. It grows 2-8 m tall. The young branches can have hairs. The bark is cracked and reddish on older branches. The leaf blades are 10-30 cm long by 4-15 cm wide. They are oval. They are leathery. The flowers are in clusters and hang from the ends of the branches. There are 3-17 flowers in a group and they have a sweet scent. The flower petals are white with purple spots on the throat. The fruit is 2-5 cm long and round. They are rust coloured. The seeds are brown and 7 mm long by 5 mm wide and 1 mm thick.
Corolla white with red-purple spots at throat, golden pubescent outside when dry; tube short, 4.7–7.2 cm long, narrowly cylindrical below, campanulate above, the campanulate portion 2.7–4.4 cm long and 1.8–4.7 cm wide at the top, cylindrical part 0.3–0.4 cm wide, glabrescent within; lobes 1.1–3.4 × 1.2–2.3 cm, ovate, acute or sometimes obtuse, whitish tomentose above, overlapping to the left in bud.
Leaf blades 9.5–30 × 4–15 cm, oblanceolate to elliptic or sometimes obovate to broadly obovate, apex rounded to shortly acuminate, base cuneate, coriaceous, often drying yellowish-green, glabrous above, pubescent to glabrescent beneath; domatia usually present; petiole 3–15 mm long, glabrous to velutinous; stipules 4–5 mm long, triangular, long acuminate, soon caducous.
Flowers sweet-scented, pendulous in terminal, 3–17-flowered inflorescences; peduncle up to 15 mm long; usually with primary and secondary branches present, yellowish pubescent when young, flaking and reddish when older; pedicels absent; bracteoles 1.5–5 mm long, triangular.
Calyx yellowish-to amber-pubescent; tube c. 5-grooved and wrinkled when dry, 5–10 mm long; limb-tube 4–14 mm long, distinctly wider than the tube, with 5-ridges; lobes linear, 0.3–20 × 1.5–2.5(4) mm.
Small tree (0.9)1.8–8.4 m tall; young branches puberulous or velutinous, older branches with cracked reddish bark.
Fruit 1.9–4.6 cm long, globose to ellipsoid, rust-coloured, flaking, the calyx limb persistent.
Style 3.3–4.5 cm long gradually widening towards apex.
Pollen presenter included, 1.3–2.1 × 0.25–0.4 cm.
Anthers entirely included, 1.4–2.1 cm long.
Seeds brown, 7 × 5 × c. 1.25 mm.
Life form -
Growth form tree
Growth support -
Foliage retention -
Sexuality hermaphrodite
Pollination -
Spread -
Mature width (meter) -
Mature height (meter) 1.9 - 8.2
Root system -
Rooting depth (meter) -
Root diameter (meter) -
Flower color
Blooming months -
Fruit color
Fruiting months -
Nitrogen fixer -
Photosynthetic pathway -

Environment

It is a tropical plant. It grows in the lowlands and the highlands. It grows in dry woodland. It is often on rocky hills. It grows between 550-1,770 m altitude. In Tanzania it grows between 1,100-1,900 m above sea level.
More
Brachystegia woodland at elevations from 1,100-1,900 metres.
Light -
Soil humidity -
Soil texture -
Soil acidity -
Soil nutriment -
Hardiness (USDA) 9-12

Usage

The ripe fruit pulp is juicy and edible. The hard outer case is broken to remove the soft pulp.
Uses material medicinal wood
Edible fruits leaves seeds
Therapeutic use -
Human toxicity -
Animal toxicity -

Cultivation

Plants can be grown by seeds.
Mode seedlings
Germination duration (days) 30 - 90
Germination temperacture (C°) 21 - 23
Germination luminosity -
Germination treatment soaking
Minimum temperature (C°) -
Optimum temperature (C°) -
Size -
Vigor -
Productivity -

Distribution

Rothmannia engleriana world distribution map, present in Angola, Burkina Faso, Mozambique, Tanzania, United Republic of, and Zambia

Conservation status

Rothmannia engleriana threat status: Least Concern

Identifiers

LSID urn:lsid:ipni.org:names:765120-1
WFO ID wfo-0000298224
COL ID 4TGCQ
BDTFX ID -
INPN ID -
Wikipedia (EN)
Wikipedia (FR)

Synonyms

Randia engleriana Randia kuhniana Randia lacourtiana Randia lemairei Randia ternifolia Randia katentaniae Rothmannia engleriana Rothmannia kuhniana Rothmannia engleriana var. ternifolia